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To get the Greates Common Factor (GCF) of 550 and 10890 we need to factor each value first and then we choose all the copies of factors and multiply them:
|550: ||2|| || ||5||5||11|| |
|10890: ||2||3||3||5|| ||11||11|
|GCF: ||2|| || ||5|| ||11|| |
The Greates Common Factor (GCF) is: 2 x 5 x 11 = 110